Spacechase is a video game published by Games by Apollo for the Atari 2600/VCS home console and the Atari 8-bit computer line. Spacechase was programmed by Ed Salvo.
In orbit of an unnamed "moon", the player uses a Starcruiser to destroy formations of alien enemy raiders that attack from above. The lunar surface rotates in the background, but has no effect on gameplay. The player's ship can maneuver in eight directions within the lower third of the game screen. As the game advances, the aliens attacks begin to include "Lazer-Directed Heat-Seeking Proton Missiles".
The game features single and two-player games, with the latter having players alternate turns. The game can be handicapped for each player by setting the Atari's Difficulty Switch. In the "A" position the player's shots are slower than when the switch is in the "B" position.